\documentclass{article}
\begin{document}

\section{Text Formatting}

This is normal text.

\textbf{This is bold text.}

\textit{This is italic text.}

\underline{This is underlined text.}

\emph{This is emphasized text.}

\texttt{This is monospace text.}

You can also combine formatting: \textbf{\textit{bold and italic}}.

\end{document}
